A bending-insensitive single-mode fiber with ultralow attenuation includes a core layer and cladding layers. The cladding layers includes an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer, an auxiliary outer cladding layer surrounding the trench cladding layer, and an outer cladding layer surrounding the auxiliary cladding layer. The core layer has a radius of 3.0 to 3.9 µm and a relative refractive index of -0.04% to 0.12%. The inner cladding layer has a radius of 8 to 14 µm and a relative refractive index -0.35% to -0.10%. The trench cladding layer has a radius of 14 to 20 µm and a relative refractive index of -0.6% to -0.2%. The auxiliary outer cladding layer has a radius of 35 to 50 µm and a relative refractive index of -0.4% to -0.15%. The outer cladding layer is a pure silica glass layer.
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